Ore fiberizing machine



.Jan. 25, 1955 J.ZJ..DEN,OVAN ETAL 2,700,511

v ORE FIBERIZI-NG MACHINE Filed June 6, 1952 4 I 2 Sheets-Sheet 2INVENTORSA UnitedStatcs, Patent Patented-1.1 elm-1.25 s 1955 1? 2* end.of thethub. .17.. 'The. driving. sheave is located outside the casmg.1,. as. shown, .andis driven inany suitable man: 2700 ner.(not shown) YQ. Mounted on the hub "for revolution therewith is a series ORE.MACHINEE:

101mg. .D'novannLachin'e, Quebec,..and Robert. A5. Denovan, .Montreal:West, Quebec, Canada;

This application relates to' ore,.androckjdisintegrating or fiberizingmachines, and is a continuation-impart of application-SerialsNo.204,034,-fi1ed: J anuary 2,.-195 l.

The invention is'particularly applicable to the treatment of asbestosoreforrelease of fibers therefrom, and has :for: its object theprovision .of..a machine capable of increased output while releasing.fibers. from the,ore without appreciable destruction of such fibers.Anotherobject is to providea fiberizing machine which. is simpleinstructure and subject to convenient anddnexpensive-rmaint'enance. 1'

The invention contemplates thetprovision, inlisuchsa machine;of.,a-.plurality of series..oflbentrifugally,acting impactedevices orhammers of meansfo'r mounting-such hammers for convenient and rapidassembly in or disassembly from the machine, and of driving meansassociated with the mounting means for effective and troublefreeoperation of the machine.

The invention will be described with reference to the accompanyingdrawing, in which Figure 1 is a sectional elevation of a machine inaccordance with the invention, and

Figure 2 is an enlarged sectional plan view of the machine.

In the drawing, 1 is a cylindrical casing having a top closure plate 2and a conical bottom portion 3 leading to an axial discharge outlet 4.

The casing is lined with a plurality of superimposed rings 5 and 6, eachof which is preferably of segmental character for ease of manufacture,assembly and maintenance. Rings 5 and 6 are of different structure,rings 5 constituting the lowermost, topmost, and each alternate ring,and rings 6 constituting the remaining alternate rings, in the lining.

The bottom or lowermost ring 5 is seated upon an annular flange 7provided at the top of conical portion 3. Each ring 5 comprises aplurality of segments 5a, which may be bolted to the casing wall asshown. Each segment 5a carries substantially midway between its ends aradially inwardly directedy finger or baflle 8, one of the lateral facesof which is radially grooved at 9 to provide a generally concavesurface. Preferably, the inner surfaces of the segments are downwardlyinclined, as indicated at 10, to direct downwardly the material undertreatment.

Each ring 6 is composed of a plurality of segments 6a bolted to thecasing wall and having a serrated or sawtooth inner surface 11. Theouter corners of each ring 5 are preferably recessed as indicated at 12to receive annular shoulders 13 on each ring 6 and thus provideinterlocking engagement therebetween.

Any desired number of rings 5 and 6 may be employed. In the embodimentillustrated four rings 5 with three alternate rings 6 are provided. Eachsegmental ring described is shown as comprising eight segments, whichhas been found to be a satisfactory arrangement, but the number ofsegments and baflles 8 may be varied as required.

Extending axially through the casing is a stationary shaft 14, the lowerend of which is supported in frame member 15, and the upper end of whichis supported by a bracket 16. A tubular hub 17 is rotatably mounted onthe shaft by means of a lower ball bearing assembly 18 and an upper ballbearing assembly 19. Bearing 18 is carried by housing 20 fixed to thehub and having sealing engagement with the end of the shaft by means ofsealing ring 21. Bearing 19 is carried by housing 22 fixed to a 3driving sheave 23, which in turn is bolted to the upper of. generally.radially...extendingjmpact. devicesv orihammers2'4',ftthe free:orh'outer. end portions of which .are. ar.. ranged-to.revolve'betweenthe upper: and adjacent series of .baffls. 8.. Also.mounted on the..hub for. revolution therewith are a plurality (two asshown)..iof seriesl'ofiradially. extending. hammers. 25,. .thef free.end portions of whiclriare. arranged to revolve between .each'lof.t'hremain: ingad acent series. of. baffles .8..I the number .of hamemersin xeachise'ri'e's. may. vary, sixhas .been 'foimdt'o. be. asatisfactory I number.

A. convenient. and preferred, means -.for mounting',each series ofhammers=24and 25jon .the-Jhub .17.?comprisesa plurality ,(feur .asshown){of radially'ljextending.:higSJfE and upper and lower annul'anpla'tes27Cand.28',".each having a respective central. opening 2Ta"or'28a"ofsufiicientldianu eter to-enable thev plate to be passed over thelugs';26.on.th'e hub... Eachl'plate' is provided with''a plurality ofcomple' mentary lugs .29l'extendin'g inwardly, from.v the .edge. ofopening ,2721 and 2822. on. assembly, each' pair. of, plates 27 and 28''are. positioned with. each J pair .of theirllugs .29 inengagementlwitha"lug. 26' lyin'g therebetween and the lugs 29" areappropriately/fixed to lugs 26" as by. welding.

The inner. end of .eachha'mmer; .24. and 25 ispiyotally securedbetween.:a','respe ctive pairi.of plates. 27 and. 28 bymeans of a pin30which'extends through the inner end of the hammer and registeringopenings 31 and 32 in the respective plates. Plate 27 is provided with araised portion 33 extendind around each opening 31, such raised portion33 being recessed at 34 on its inner edge to receive a laterallyextending lug 35 constituting an offset head of each pin 30. The lowerend of each pin 30 engages an annular flanged edge portion 36 of plate28. The lower end of each pin is notched at 37 to receive a spring ring38 which retains the pins in position. It will be obvious that the meansfor mounting the hammers, as described, permits convenient removal andreplacement of the hammers. Preferably, as shown, the hammers 24 aresomewhat heavier than hammers 25 and their radius of revolution issomewhat shorter than that of hammers 25. Each hammer 24 and 25 has itslateral faces grooved as indicated at 39 and 40 to provide concaveimpact surfaces thereon.

Closure plate 2 is provided with an axially offset ore inlet chute 41,which as shown is located directly above tzlze path of movement of theimpact surfaces of hammers Access to the interior of casing 1 ispreferably provided by forming the front semi-cylindrical half of thecasing as two doors 42 hinged at 43 to the semi cylindrical back half ofthe casing.

In operation, the hub 17 is driven to revolve the hammers 24 and 25,centrifugal force normally maintaining the latter in radially extendedposition. However, due to the pivotal mounting of the hammers, they arefree to swing out of such position should tramp objects, such as piecesof metal and the like, come into contact therewith. Ore is fed throughinlet 41 directly into the path of the upper series of hammers 24 which,since they are heavier and revolve through a smaller orbit, have a lowervelocity than that of hammers 25. Thus, their impact on the pieces ofore is less intense and, to a proportional degree, their damaging effecton the first release of fibers from the ore is less. It will be observedthat the series of hammers 24 (as well as each series of hammers 25) islocated laterally opposite a serrated liner ring 6, which cooperateswith the hammers to release fibers from the ore.

It will be observed that the concave surfaces of the bafiles 7 face in acircumferential direction which is opposite to the direction ofrevolution of the hammers 24 and 25. These surfaces are arranged toengage the pieces of ore following their impact with the hammers andthereby remove the rotational velocity therefrom prior to theirengagement by the next succeeding series of hammers for more effectivetreatment thereby.

For the treatment of asbestos ore, the machine is normally run at 900 R.P.M. and the size of the feed ore is minus 2" mesh. Under theseconditions, the impact of the hammers breaks the ore and releases thefibers without appreciable destruction, since there is no rubbing. Thecapacity of the machine varies with the material being processed and theinput power. Under average conditions, the machine will handle 50 tonsper hour of minus 2 mesh ore and require a power input of 200 hp.

The arrangement of a stationary shaft to carry the rotor permitstheprovision of a rigid and fully protected bearing assembly. Moreover,the entire shaft assembly may be simply and easily removed if necessary.

What is claimed is:

1. A fiberizing machine comprising a generally vertically' disposedcylindrical casing, a driven cylindrical member axially mounted withinthe casing, a plurality of series of substantially horizontally disposedimpact hammers pivotally carried by said driven member within thecasing, and means for independently mounting each said series of hammerson said driven member comprising for each said series an upper and alower annular plate fixed to the driven member, the inner ends of eachsaid series of hammers being disposed between a respective pair of saidplates, a pin extending through each hammer and pair of plates, meanscarried by the upper plate for locking the heads of said pins thereon,the lower end of each said pin having a notch therein below said lowerplate, and a single spring ring engaging the notches in all the pins ofone said series of hammers to releasably retain said pins in position.

2. A fiberizing machine as defined in claim 1, each said pin having alaterally extending head portion, and

... -2,7oo,a11

' said upper plate locking means comprising a raised portion on saidplate partially surrounding each said head. portion to restrain movementthereof.

3. A fiberizing machine comprising a generally vertically disposedcylindrical casing, a driven cylindrical member axially mounted withinthe casing, a plurality of series of substantially horizontally disposedimpact hammers, and means for independently mounting each said series ofhammers on said cylindrical member comprising for each said series anupper and a lower annular plate, said member having a plurality of lugsextending radially between each said pair of plates, each said upper andlower plate having an axial opening through which said member extendsand the edge of which is beyond the ends of said lugs to permit passageof the lugs therethrough, each said upper and lower plate also having aplurality of complementary lugs extending into said opening and engagingand fixed to said first lugs, the inner ends of said hammers beingpivotally disposed between each said pair of plates.

References Cited in the file of this patent UNITED STATES PATENTS248,923 DeChamp Nov. 1, 1881 1,212,419 Sturtevant Jan. 16, 19171,492,102 Nelson Apr. 29, 1924 1,636,033 Agnew July 19, 1927 1,669,239Grindle May 8, 1928 1,798,465 Grindle Mar. 31, 1931 2,359,911 GrindleOct. 10, 1944 2,360,086 Thurman Oct. 10, 1944 2,607,538 Larson Aug.'19,1952

